From 40+ years of experience as a martial-artist, the ONLY thing a black belt is good for is to "hold up your pants"!!!
Truer words were never spoken by the great Bruce Lee!!
Achieving a first-degree-black-belt/Shodan rank (gee, I've gotten several) is like getting an undergraduate college degree...it depends on where you got it and what you can do with it after you get it THAT REALLY COUNTS!!!
Over the years of my MA training, I've seen unbelievable variability (!) in the standards for awarding an MA student a first-degree black belt in the hard arts...e.g. in one school, you had to train only 4 hours a week for 2 years and pass their exams...in another, a minimum of 1000 hrs. of training, plus pass their exams...and, if I recall correctly, the great Joe Lewis would award you one if you could last 3 rounds with him in the kickboxing ring, etc.
And, I've seen/heard-of several "black belts" who got their butt kicked in a REAL (street) fight...myself included!
However, the REAL MEN that compete in the professional kickboxing/MMA arena...Pride, UFC, K-1, King of the Cage, Muay Thai, etc...are TRUE WARRIORS and I SALUTE ALL of them...regardless of their ever being awarded a "black belt"!!!